3 * Copyright 2006 Free Software Foundation, Inc.
5 * This file is part of GNU Radio
7 * GNU Radio is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 3, or (at your option)
12 * GNU Radio is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with GNU Radio; see the file COPYING. If not, write to
19 * the Free Software Foundation, Inc., 51 Franklin Street,
20 * Boston, MA 02110-1301, USA.
27 #include <atsc_randomizer.h>
28 #include <gr_io_signature.h>
29 #include <atsc_consts.h>
33 atsc_make_randomizer()
35 return atsc_randomizer_sptr(new atsc_randomizer());
38 atsc_randomizer::atsc_randomizer()
39 : gr_sync_block("atsc_randomizer",
40 gr_make_io_signature(1, 1, sizeof(atsc_mpeg_packet)),
41 gr_make_io_signature(1, 1, sizeof(atsc_mpeg_packet_no_sync)))
47 atsc_randomizer::reset()
55 atsc_randomizer::work (int noutput_items,
56 gr_vector_const_void_star &input_items,
57 gr_vector_void_star &output_items)
59 const atsc_mpeg_packet *in = (const atsc_mpeg_packet *) input_items[0];
60 atsc_mpeg_packet_no_sync *out = (atsc_mpeg_packet_no_sync *) output_items[0];
62 for (int i = 0; i < noutput_items; i++){
64 // sanity check incoming data.
65 assert((in[i].data[0] == MPEG_SYNC_BYTE));
66 assert((in[i].data[1] & MPEG_TRANSPORT_ERROR_BIT) == 0);
68 // initialize plinfo for downstream
70 // We do this here because the randomizer is effectively
71 // the head of the tx processing chain
73 out[i].pli.set_regular_seg(d_field2, d_segno);
80 if (out[i].pli.first_regular_seg_p())
83 d_rand.randomize(out[i], in[i]);